1455
1455 is the year the Wars of the Roses began.
- Odd
- Composite
Where 1455 fits
Why 1455 is special
Thirty years of intermittent dynastic conflict between two branches of the same family. The rose symbolism was largely applied afterwards, particularly by the Tudors, who benefited from presenting themselves as the resolution.
1455 is part of
Factors & digit properties
- Divisors (8)
- 1, 3, 5, 15, 97, 291, 485, 1455
- Prime factorisation
- 3 × 5 × 97
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 1455
- Scientific notation
- 1.455 × 10^3
Roman numerals
M C D L V
MCDLV uses the subtractive pair CD: a hundred before five hundred — five hundred minus a hundred.
Binary
1 0 1 1 0 1 0 1 1 1 1
1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,455
Octal
2 6 5 7
2 × 512 + 6 × 64 + 5 × 8 + 7 × 1 = 1,455
Hexadecimal
5 a f
5 × 256 + a × 16 + f × 1 = 1,455
Read as powers of two: 1,024 + 256 + 128 + 32 + 8 + 4 + 2 + 1 = 1,455.
In historical numeral systems
Egyptian
1 lotus, 4 coils of rope, 5 hobbles, 5 strokes
1 × 1,000 + 4 × 100 + 5 × 10 + 5 × 1 = 1,455. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 4 vertical wedges (sixties place), 1 corner wedge + 5 vertical wedges (units place)
24 × 60 + 15 = 1455. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Harshad (Niven) number
- Lucky number (mathematical sieve)
Related numbers & connections
1455 is a year in the 15th century, in the 1450s.
The Wars of the Roses began in 1455 and Tewkesbury in 1471 destroyed the Lancastrian cause, though fighting resumed and ran until 1485.
View 1471 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- developed from1471
why?
Strength 0.50, confidence "high".
History
In 1455, the Gutenberg Bible was printed, the first substantial European book made with movable type (Germany).
DocumentedHistoryGeography: GermanyPeriod: 1455In 1455, the Wars of the Roses began at St Albans (England).
DocumentedHistoryGeography: EnglandPeriod: 1455The competing roses as emblems of Lancaster and York were emphasised retrospectively, notably by Henry VII, whose claim was strengthened by presenting his reign as the union of two warring houses. The name postdates the wars.
DocumentedHistoryGeography: EnglandPeriod: 1455–1487
Common questions
Is 1455 a prime number?
No, 1455 is not prime.
What are the factors of 1455?
The factors of 1455 are 1, 3, 5, 15, 97, 291, 485, 1455.
What is 1455 in Roman numerals?
1455 in Roman numerals is MCDLV. CD is subtractive: a hundred before five hundred — five hundred minus a hundred. Written additively it would be MCCCCLV, which Roman inscriptions used freely — the strict subtractive form is a later convention.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 3 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026